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To provide stable output power of a gyrotron during long operation time the power stabilization was achieved by two schemes with PID feedback control of heater current and anode voltage. It was based on the dependence of the output power on both the anode voltage and the beam current and also on the dependence of the beam current on the gun heater current. Both schemes provided decrease of the power...
Nowadays, users of microwave devices have demand for devices with certain parameters: 1) High level of average output power (low pulse ratio modes) while pulse output power is relatively low. 2) Low operating voltage 3) Broad instantaneous amplification band 4) Small size and low weight.
Beam current of gyrotron was stabilized from 17 % to 0.5% by the feedback control to adjust the heater voltage of electron gun. The fluctuation level of output power was decreased from 15 % to 5 %. More effective stabilization of the output power up to 2% was attained by feedback control to adjust heater voltage.
Due to the ever increasing demand on energy and environmentally friendly sources of energy, it has become important to introduce a source of energy that is efficient and eco-friendly. In this paper, a parametric study of the PEM fuel cell is conducted in order to investigate the effect of different operating parameters on the efficiency and energy output of the cell, and later design parameters are...
In LHD, an ECH system for fusion-relevant plasma heating has been greatly progressed with the development of megawatt gyrotrons. Net power of 3.7 MW could be injected into LHD. For stable operation, a new position and profile monitor of the mmw-beams in evacuated transmission lines is developed.
Recent progress on a high power 170 GHz gyrotron development in JAEA is presented. After the demonstration of ITER basic performance, the gyrotron has been operated for 3 years, and recorded ~200 GJ of total output energy. As a next activity, a study of a CW-power modulation of the gyrotron for NTM (Neo classical Tearing Mode) stabilization has started. Up to now, power modulation of 5 kHz for short...
A power processing system design for a space-type high power (200W RF) multi-stage depressed collector traveling wave tube is described. Operating requirements are set forth and a block diagram is presented illustrating the overall approach used in providing the requisite outputs. The basic power circuit is illustrated and overall performance, design characteristics and unique features are discussed.
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